Voltage and current spectra for a single-phase voltage source inverter

摘要

An inverter converts a direct current power supply to an alternating current power supply. To do so, its output is switched at high frequency between the inputs in order to synthesize the desired alternating current output in the low-frequency part of the Fourier spectrum. Here, we calculate analytical expressions for the input and output current and voltage spectra for two inverter designs: so-called single-phase-leg and two-phase-leg inverters. The output voltage and current spectra are well known but are found here by a new, analytically compact means. More significantly, the input current spectra for the two designs are calculated here for the first time. A prior, approximate method for determining the input current spectrum (which assumes an exactly sinusoidal output current) is compared with our exact results.